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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b162ba47acb38aa39f253064f350a5e5f5c047a777d150705cfc5b1a434b5478' 
  AND token = 'sZw/lhmQUUG5jnQFSa9RWzhfbNiHrM30J7C5dWnF6Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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