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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6769cdd1c615b53aa1fed669bf2802af53a39dd88a4a73c6f696a8ce7c99c640' 
  AND token = 'XhQKYG71b93oOZ8lADTfWKYthW7xOT6nWLT89OuwhAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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