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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5850975d42452b23cf27f98e4d249036088c6afb991291270271092f6abd0d20' 
  AND token = 'tSCDqPeKNoSD55PTZwoB6io5vsgt31tbdhGhp5uDR+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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