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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4ab73b48aae658ea51db759d3a9ca1386347aa99da24ab3be0511758cf330d' 
  AND token = 'Y5KgS0Sa/T7TuY2jxJHHYwHK7n1g5PYoTLfl+YpEfqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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