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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98daa13f6fea660298cf9d9c75a9dbb476c96e3bf11ee7d83220f1001aa33a4e' 
  AND token = 'p5XXtrBYaUJ4SXYXINYeXV4fUMAtU1AApvfPteqn/4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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