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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3f2fe75d9006bfc066765aafc9ff4ccaeecc6bc9aede9b76bf3e3936289a2c' 
  AND token = 'bSdpK5v6BckJJwj4e9BzB53CCZXT/fi9WKOfrHNjXkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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