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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f22dbe95bf15140e0e534453c5d566c804fc6ae97bf17c1717d7435c977f27' 
  AND token = '7SkYYrMwVaUEBHnhRWCTkI+Rac/VUxhQ1G8YA7RBYbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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