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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a999917246972d23980dd95308b86247f4218796253df273631f7b9a29ce73' 
  AND token = 'k+cOYaMG6tnrdANWOPgFGMvbzeNdVME4TbH1AIrbuWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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