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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029aa1aa0db27daaa17287eac39acacb2644b228a2d0b843f60c68243704ace6' 
  AND token = '4y1G7okzGRl+pnsgkKqE/IXAL6jivghhBZgW+w+nsvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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