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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e00aca05d2132fc54f912f54efd51fbe6ad2e01899c22875db16d331abdd3f55' 
  AND token = 'ZeFP65ogWIZkS7TxkqpQ9u8A4UE4JYSROCiMtvYrxv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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