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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff67205fda414f653c6f1b3441ff3f2d34fa6a600b4c769c24698c6261927cdf' 
  AND token = '/ME6U8XVWAaVIcEjxC5e1FPVFmPkKrzq/uUUxdUPYZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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