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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe83a5c64d5051872cdf40840a9059e20a363acaa31babed45c60197c0dc0af8' 
  AND token = '9rrJMeCZpGwlVg17Lan8wpE/rvlZtO/y+viukviOWQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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