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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b27cf7973117ff5b7b6652f6e8f047f832acb7d267b59272fe3eeb5bba53ea' 
  AND token = 'aVPZAegHILA+kBskRA9hLmuo5pyhS77ZaGDcVXHcc48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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