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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '143897087f89b50fbe52e98d3433babb15d48e14e9e6c5320427c01a11764296' 
  AND token = 'J+M1whMeEWW/kuepqGQc7l8cD+gh4kAPToPDf0McAAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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