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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2e81cc52c917ff9ae417851f1923409fd969660822ad75aa7c3b1707f31a75' 
  AND token = 'VjDi0UxHV8UwxgVVCa2x5sVtVe5G32HPWvGGeLX8Ruc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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