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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c521020c31da2cc091c06d57763d3de39d8013afeecac10554ffb44a107912' 
  AND token = 'U2XWYqqWSdMFNPF/putG2PfLizdBBx/s78AojByJgD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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