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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110a382faf1fbece92c18571e9de1906f6ff5aca7a83380891aec81e67b5ba9b' 
  AND token = '/UaSusc7CmbGQQFRMhkk4cIsqZVr6zKp8D5cXPJf0Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}