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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9675514fa0d18828640251d835b991a8264dfdb32e836d271c98a74e3f9db600' 
  AND token = '/N+1e04s0arPC3u7hIu1NyFYpQQSquHxN9Boy0MEXQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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