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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d878db1206becdd08211a4ba2f5687a719fbbcfeb86072e94d38c389a9fe95' 
  AND token = '4bJ/lmcYSuu4Xfis1UiOwUN7o3E4LKuoGI1C+1ApjE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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