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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a35d8ebf5c2a4d42c7db721bb5378f1c6f462aaa5a55492ca07bd21825d631' 
  AND token = 'N/D5aF7jO18k70w5+3oHagekHZcxckzzjHIKadNwZRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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