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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa8d54acb13c70d99bc3bcd305864dff657e9141834f13a461757fcce8d1850' 
  AND token = 'BlcmYcJKPNucc0/XElfxyq7J0fZ1B2lOHGnaZDx8CPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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