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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd9a20e33a83c327c17c2c13408d30396f620aaee3c780ee40a796ba94b74ff' 
  AND token = 'IZGj8j8TkonVlwG18u+q1KklL/4QL5C72m+o1laQEMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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