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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693522a166f793df95c5226a1e21323c97740bbd9a0050179b5a9b33c4f44414' 
  AND token = 'S0RqinjXl7MFWToZ4Znig4jUjLK0RfrJsbQDjKpVjDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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