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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171a0d04cb19b276d6444c0ab5ab444cc11524fc7e79085e49a793840a39621a' 
  AND token = '40bPUi0Meywawkyuzm7gSlCIsU1ZZxxK7QC/0ITW5Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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