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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e92c80f5f0879051fd53added523ea51b5f9e5f253cbcfb9551e599534d9f4e' 
  AND token = 'Pxk6jSGEZQzYS7NyF/ftr15O6cCLe+T8x9j4wXTitLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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