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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97c07f29a0f74abbb93e71da61c16c6bda035a00402c84f58d106e8743d61ea' 
  AND token = 'LHtatzKnv7IOkgO2fUQQ5DUAlxIQnKLLrD4c4H5av+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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