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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da5beb19bf241123026a0e5c269bfb123286418a5b1e5b6c52e089b3ef9a98d' 
  AND token = '8d210SXSI41yEkimtT+PXgsakbGdlZU/l1IeVbnRTLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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