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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '217b73428410e21409172dce2b974b792b43eccd6e8ee42551b58bd754e3eb16' 
  AND token = 'gFNMaO3jEgI2Q8+JIJPUXJ3SSonS+mAI8AXZy1SHw7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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