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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f4961170f82702f25f7573d3419fc5e626db1cf4dd4da4f5d4597a1fe52f8a' 
  AND token = 'E1Ff5i21dJQv26Ab7k3yZuJhdSRDHkoX5iHgULyrcJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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