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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03de936b036abc4c01d168ecc4cffd4c0453dfdfa444d92e0f20c3f77cf9f8d' 
  AND token = 'r7jw2M8xzrdo7uUyucOHJ0O7ZGiD67FXY3lI/jG7SKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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