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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37cf68653cf3750ec12aff78e54d3211a3920c8ecedb3b660aa402191fba811d' 
  AND token = 'D2JJrxm0/6asbO74KcclsZHgD0KIgfi4c0VeTLwE2+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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