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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6ca785797cd09b371ed0562124ae5facd7060ab0e6de1b783a4ebb202093c49' 
  AND token = 'OSIMQ+95senNLx69xwauKrWTfjZTEW3v54+eubXhJF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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