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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12fa9c422d30c60df9ea682ce5c4268cffdfc6adc5a2a98d7b611126d4b547a8' 
  AND token = 'K1zoD8+ibSR7707I8nZjvaO5uQTODNC82nOPLdZqiXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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