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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41662f8a6606e60bd5d2f3987e4c3a1d677d73d73408f4615e3321602d383d6f' 
  AND token = 'jpvEZbC+nPqntnLYRnoDLb53WemJBiY6NREcLH8Kv00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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