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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1a97d5ab3549422ab22196e91ab5660e209d6955754a8d78499113ba69aefb' 
  AND token = 'lzaf036aIpOx6+2Bsug7/tJ8PulF8LiJOwWzp35i5rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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