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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd443ffe408eeeb9ac93101b9b75099b8a2436ff9b1bc640a2a897816745c5f5c' 
  AND token = '00gutYfbB7/JJ3Muuf40KGVNgSutQ5T925uCukiBx3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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