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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a773a4ff13812ca7db22dc93e79d9583f5e176255514ec1ed26e3db5573ac7' 
  AND token = 'Bpy6G6hB42EL9xwNPu62b3FsPdvMi/veDAvb+bmjdMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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