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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb9b8762c0fe54b28d5a815d9566334d819720aafc1d349fe955f3c2a11958b' 
  AND token = 'cqdocA6ZvojJ6zb83U6qLPgTvIvmsYM5T4lxdQLI0DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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