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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a633250277baf0b1401df42667d6874467e1dc727d5aba2190174bf8f3c16a10' 
  AND token = 'dXx2GuJc4mpbA/dsi0kL/FSZMo+Dol8n2S/KETGkQ/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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