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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ca6ac0caf3af89fa41a540a77d36cbc902a9e10d53118358d3ea806b5c4890' 
  AND token = '+BR6dfBbFJBLD7MUc/+bNvepzgCAe9PEVLj4qOC67EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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