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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2370d5ddc534615e17b481043fe5a8932717e4dc67d88475e4833eb3268d4e5a' 
  AND token = '1glLpT64jN7/t2z0LiJA5/bifxTzNjd9Vx/ULy2OS7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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