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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b58c0eb0f1ab59b9d06c870ca763853522e060d9d6453ebba31076b7e9a3700' 
  AND token = '0+872YmYndK8Eq1QPYZ6bPtHPBTGko1F7bgybnftACQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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