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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996c9990873a6b0d4ecaa4098dbf7017b5fc1a10d8d9a6b7828d916c2ed48a42' 
  AND token = 'VxKJfKJwAAfV36ncBcjQh+pj6Opwe3HB0Aboli9fnsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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