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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4e2b1189876a77af866fec8451d76599a98384c0630cde7a47c56c49d56680' 
  AND token = 'ud1w4vRKOim6bgHyZ4S3iuwLEQ/n9HPqIlP2eWgJ7fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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