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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960788d8aa677c1f383c5de5b240835c301603a3824fe69f6f675fa02451a69f' 
  AND token = 'WjRpZMBzh/F9Veua7jCpb6rytkQ3tyKNvFM2HCd7HGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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