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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b91cfce5178165adef561d2927666abd85c6de82c650fd52cbc4bfee5fe50a6' 
  AND token = 'FI6NdllYpxRvEXeMD69fIzNAWfYHEv9RdpnbHOJbNbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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