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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6c3da5f329bfb750ceb6235580909e88f7340ca16ffa69bd157aeaed3fcb8d' 
  AND token = 'Foz0O+Syxji1CRnnEov/Eu7jGA3vNS6ss5zGpOc5++I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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