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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060fd9e07bed7faea9d526cce59bc4442c28d08d6f6bd5b943ae04aeb2510af9' 
  AND token = 'pOvUYS5JLXO6WgKoC+7p9jq0ypOD4tSBYTYwI1/jXE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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