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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7e743f19349d3da0fafd6fa52ddc9ac9d9f07096b72ba849e39072edf9538f' 
  AND token = '6M20whtd5pby09lZ1QcPZkFhePTCh4vAHmsYhqjBBS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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