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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee27efeef7932c3871711622773b701ca60341a7f5ca10c30be2adac9de2ef4' 
  AND token = 'XqgipP6fPeqvmMuBg83vGVY2UqUi9K6Hj9JOq5VLuew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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