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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b54296e28e88224c7818873b62d9d513faefedacb5b67de2ba507f8886d66f9' 
  AND token = '4qdh/niRqlaNBvhOZ7cmoH6e7SXH0aPtImjx2WjEsLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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