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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe62234b0ce12b4b5b4021c60fc579c2d64936b293478d991d20b062c68e305d' 
  AND token = 'cLTJSLQ9J08kA+QMTXVY52qtgCG7AUiU8JolfV7rntY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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