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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ffb01c35d98a37a878a3f5569c5fd6399447aee8aaf10cfa0b8b70cff3b08e' 
  AND token = 'Fep7HHCJ7SZuc564ky1q/Z29t/VlZsRl2QAbUHEPkH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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