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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf46be33b11eb3d726dc2d501d3e7cc217666c5a4486d4cc3deaebd874810e8' 
  AND token = '/eGkRmICT4KcWBojTonFajj8wsvvT5+Xxyl+4PsfJ7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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