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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8369ca6e5aa8c8b92bc8678bd5dcf04498a8da0cd1c701865bff07687265a73' 
  AND token = '2kNZrQQ8w9q8g5jh6WthFbnedY//bzvoBFgoHQl7e3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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