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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bbd1b9489f01aa8f86325694d15f0f617fef3f7b19a0c5a1eab10b52f9a92eb' 
  AND token = '3Fxw7TJfP/JzrNX6OPijIUbFEqY1IGvm56MbqxJfETc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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