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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766b9f8a569370460ac7dfb960a89c84800aea1aba198ef267ff8ba2d0a0103b' 
  AND token = 'y31oj5zcUySv6fzcFe9v6p/hLAgAEZHrxb84RoRUyi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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