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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea01d04f03c1ec696cc1194aecc6ebedb1de2ba8ab60809adddbacd88318dfc' 
  AND token = 'Zbq6ll3CvWNQ77Gy/9BlxOel8vucmvDLSX1Wieuj+jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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