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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb54ed61340a3041dd87e0f6e03dd879feda35a13471990bbe2ff9f41db9767' 
  AND token = 'e5It+n2aoFrocz5hLpi9RajByN+yjYBTbeTQYCIinGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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